Midland Railway System Map. The whole
Midland Railway system in one map from it's 1922 accounts. (A high
resolution version is available for download.)

Midland Railway Distance Diagrams. The
Midland Railway produced detailed maps of its whole system showing
distances of every station and junction from St. Pancras. They were
re-published at a slightly reduced scale in a series of A4
soft-bound books. The books are now out of print, but you may be
able to find them at a specialist second-hand book dealer.

Other Sources of Maps

The Midland Railway Study Centre
holds many maps of the Midland Railway system. There is an extensive
collection of “2 chain plans”; that is maps at a scale of 2 chains to
an inch or 1:792. The Study Centre also holds detailed plans of
junctions, signal box diagrams, Ordnance Survey maps and originals of
the Distance Diagrams.